Power drive for sawmill set works



Nov. 25, 194.7. I P. ORR 2,431,580

POWER DRIVE FOR SAWMILL SET WORKS Filed Jan. 19, 1944 4 Sheets-Sheet l Nov. 25, 1947. P. ORR

POWER DRIVE FOR SAWMILL SET WORKS Filed Jan. 19, 1944 '4 Sheets-Sheet 2 M I U H I jwumvbo'b Perry 07-2"; 4

Nov. 25, 1947. P. ORR

I POWER DRIVE FOR SAWMILL SET WORKS 4' Sheets-Sheet 5 Filed Jan. 19, 1944 Nov. 25, 1947. P. ORR

POWER DRIVE FOR SAWMILL SET WORKS Filed Jan. 19, 1944 4 Sheets-Sheet 4 Patented Nov. 25 1947 POWER DRIVE FOR SAWMILL SET WORKS Perry Orr, Naches, Wash, assignor of one-half to Stanus Orr, Nachos, Wash.

Application January 19, 1944, Serial No. 518,905

3 Claims.

My invention relates to set works for sawmill carriages and has particular reference to a power drive for manipulating the set shaft which in turn drives the set works to advance and recede the knees.

An important object of the invention is to provide a power drive of the above mentioned character which is more accurate than steam and eliminates the drag caused by the transmission of the steam to the set works.

A further object of the invention is to provide a power drive of the above mentioned character which is lighter than the steam actuated power drive and will cost much less.

A further object of the invention is to provide a power drive of the above mentioned character having very little upkeep.

A further object of the invention is to provide a power drive of the above mentioned character which is accurate since there is no variation of speed as the same can be driven at a constant speed, thereby eliminating inaccuracies in the operation of steam operated power drives, due to the rising and lowering of the steam pressure.

A further object of the invention is to provide a power drive of the above mentioned character that can be attached to any Armstrong type of set works at a small cost and quickly, without necessitating discarding the old set works,

A further object of the invention is to provide a power operated mechanism of the above mentioned character, the operation of which can be controlled with a minimum effort upon the part of the operator.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the drawings forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a plan view of the poWer drive of the set works, embodying my invention,

Figure 2 is an end elevation of the same,

Figure 3 is a vertical section taken on line 3--3 of Figure 1,

Figure 4 is a vertical section taken on line 44 of Figure 3, and

Figure 5 is a diagrammatic view of the transmission included in the power drive.

In the drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, a power drive is shown which is mounted at a suitable location upon the sawmill carriage. This power drive comprises a set shaft shoes.

IB journaled in stationary bearings l I, secured to the carriage. The numeral i2 designates a hub which is mounted upon the set shaft ill to rotate therewith and this hub is rigidly secured to the set shaft by a key I3 or the like. The hub l2 cannot move longitudinally of the set shaft. The hub i2 has radial flanges M, as shown in Fig. 3.

The numerals l5 and l-S designate sprocket wheels, rotatably mounted upon the set shaft l0 and alternately locked to the hub I2 for rotation therewith, by hydraulic means, to be described. Each sprocket wheel is rigidly secured to a flange H, carried by a hub l8, rotatably mounted upon the set shaft. Stop rings I9 are rigidly mounted upon the set shaft I3. A hydraulic flush device is connected with each sprocket wheel and flange l1, including a head l9. arranged between the flange I1 and the sprocket wheels and attached thereby by the bolts 23. This head has a drum 2| rigidly secured thereto. A coacting head 22 is arranged at the open end of the drum and is rigidly secured to the flange I4, for rotation therewith. As more clearly shown in Figure 4. shoes 23 are arranged within the drum 2| and are pivotally connected at their lower ends with pins 24, and these pins are secured to the head 22. The pins 24 are connected by a link 25. Pins 26 are also secured to the head 22 and extend through openings 21 formed in the shoes 23 and these openings are larger than the pins 26 to permit of the proper lateral movement of the shoes into clamping engagement with the drum 2 I, but to limit the inward swinging movement-of the The shoes 23 are swung inwardly by a. retractile coiled spring 28, connected therewith at 29.

At their free ends, the shoes 23 are provided with reduced extensions 30 which extend through openings 3|, formed in the rubber ends 32 of a cylinder 33. Mounted within the cylinder 33 are plungers 34, having suitable packings. These plungers are arranged to engage the extensions 30 to move them outwardly and expand the shoes 23 so that they have clamping engagement with the drum 2|. These extensions serve to support the cylinder 33 and hold the same in position. The p-lungers 34 are moved apart by a compressible coiled spring 33, which is weaker than the spring 28 but will prevent the plungers 3 from moving inwardly beyond limits. The cylinder 33 is provided at its center with a port or opening 31, Figures 3 and 4, and this port receives a fluid under pressure from a coupling 38, having screw 7 within the cylinder :33

bracket 43. The pipe 42 leads to an upper horizontal cylinder 44 and is connected therewith while the pipe 43 leads to a lower horizontal cylinder 45. These cylinders are held stationary and are preferably arranged near the operators seat 46. Plungers 47 and 48 are mounted to reciprocate within these cylinders and are connected with rods 49 and respectively, having pivotal connection with an upstanding lever 5|, at points above and below the pivot 52 of the lever. The

pivot 52 is carried by a stationary support 53.

The cylinders 44 and 45, upon the left side of the plungers 4! and 48,,Figure 2, the pipes 52 and G3, the hose 40 and Al, and the cylinders 33 between the plungers 34 are filled with a brake fluid, such as oil.

The numeral 55 designates a motor, suitably mounted upon the sawmill carriage and having an armature shaft 55, carrying a sprocket wheel 56, Figures 1 and 5. This sprocket wheel is rigidly mounted upon the armature shaft 55 and is engaged by a sprocket chain 57, which engages the sprocket wheel I5. The lower run of the sprocket chain 51 passes about the upper side of a sprocket wheel 58, and drives the same. This sprocket wheel 58 is rigidly mounted upon a countershaft 59, journaled in stationary bearings'fifi. A sprocket wheel 6i is rigidly secured to the counter-shaft 59 and has a sprocket chain 62 passed about the same, which also passes about the sprocket wheel I 6. As more clearly shown in Figure 5, the armature shaft 55 is turning counter-clockwise, while the counter-shaft 59 is turning clockwise. The shaft 55 therefore turns the sprocket wheel l5 counter-clockwise and the counter-shaft 59 turns the sprocket wheel l6 clockwise. The sprocket wheels I5 and [6 are therefore turning continuously in opposite directions.

In operation, the motor and associated gearing turns the sprocket wheels l5 and I6 continuously in opposite directions with relation to the set shaft I ll, which is stationary, when the lever 5| is in the vertical or neutral position. The shoes 23 do not now have sufilcient engagement with their drums 2|, which are continuously rotating, to rotate the hub I2. To turn the set shaft It in the direction of the turning movement of the sprocket wheel l5, the lever 51 is forced inwardly, whereby the plungerl! is forced forwardly while the plunger 48 is moved rearwardly. The brake fluid is therefore forced from the upper cylinder 44 and is transmitted to the cylinder 33 adjacent ,to the sprocket wheel l5, 'while the brake fluid adjacent to the sprocket wheel I5 is free to move into the lower cylinder 45. The plungers 34 in the cylinder '33 adjacent to the sprocket wheel are therefore moved -;apart and will act upon the extensions 55, forcing these extensions outwardly and expanding the shoes 23. These shoes will now have clamping engagement with the drum 2:! next to the sprocket wheel l5 and head 22 will therefore (be lockedto the adjacent drum 2!. The head 22 will now turn with the drum 2! and the head 22 will turn the hub 12 with the sprocket wheel [5 and the hub IE will turn the set shaft Ill. The set shaft is only turned for about of a revolution after which the lever 5! is returned to the neutral position and the shoes 23 moved out of clamping engagement with the adjacent brake drum 2!. Turning movement of the head 22 to the left, Figure 3, provides further slack in the flexible hose 30 and 4 I. When the set shaft I0 is to be turned in an opposite direction with the sprocket wheel Hi, the lever 59 is swung from the seat 45, Figure 2, and the plunger 48 moves forwardly and plunger 41 rearwardly. The brake fluid passes from the lower cylinder 45 into the cylinder 33 next to the sprocket wheel it and the shoes 23 next to the sprocket wheel it have clamping engagement with the adjacent brake drum 2 i. This drum now turns the head 22 in the direction of turning movement of the sprocket wheel I 5, which turning movement is transmitted to the central hub i2 and set shaft It. The set shaft Ill will now be turned with the sprocket wheel is for not more than /3 of a revolution. This turning movement of the head 22 next to the sprocket wheel 15 takes up some of the slack in the hose 4B and H, but this slack is again paid out when the lever 5! is returned to neutral position.

It is thus seen that the set shaft ill will be turned in opposite directions, at the will of the operator, and that the force for effectin this turning movement is provided by the motor 55, and the operator is only required to manipulate the lever 5i, which involves a relatively slight effort.

The set shaft l5 drives the set works in the usual manner and the knees are advanced or receded, depending upon the direction of rotation of the set shaft.

It is to be understood that the form of my invention herewith shown and described is to'be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of my invention or the scope of the subjoined claims.

Having thus described my invention, what I claim is:

1. In a power drive for set works, a set shaft, Wheels rotatably mounted upon the set shaft, means to drive the wheels in opposite directions, hydraulic clutch devices connected with the wheels and set shaft, each hydraulic clutch device including inner and outer units adapted to have clamping engagement with each other and to then both turn with the set shaft cylinders drums secured to the wheels, a'hub arranged be tween the wheels and mounted upon the set shaft to rotate therewith, heads secured to the hub to rotate therewith, expansible devices mounted upon the heads for engagement with the drums and turning with the set shaft when the set shaft turns, hydraulic devices to operate thee-x-pansible devices and mounted upon the head to rotate therewith and means to .supply a fluid under-pres- 5 sure to the hydraulic devices including flexible tubes connected with the hydraulic devices and having slack,

3. In a power drive for set works, a set shaft, spaced Wheels rotatably mounted upon the set shaft, means to drive the wheels in opposite directions, a hub arranged between the wheels and mounted upon the set shaft to turn therewith, a drum connected with each wheel to turn therewith, a head arranged adjacent to each drum and mounted upon the hub to turn therewith, a hydraulic device mounted upon each head to turn therewith and having a part to frictionally engage with the drum, flexible tubes disposed adjacent to the hub and separate from the hub and connected with the hydraulic devices, the flexible tubes having sufiicient slack to permit of the turning movement of the hub, and means to 6 force fluid under pressure through the flexible hose.

PERRY ORR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

